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flickertail

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About flickertail

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    Space Invader
  • Birthday 06/01/1971

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  1. Nothing like responding to your own posts... I ended up figuring out the spacing issue. I figured out that if I set COLUBK after the Big Sprite scanlines have finished, but before the Overscan, the spacing problem goes way.🤷‍♂️ Here's a revised version on 8bitworkshop: Stranger Things I gave it a bit more ST edging.
  2. Looking for thoughts on how to improve this code for a splash screen. You can see the code and test runs at this 8bitworkshop link: 8bitworkshop - 96 pixel sprite - interlaced with Stranger Things font I've been trying to implement a 96 pixel sprite based on the code from Steven Hugg's book and various code snippets for interlacing frames available online. I created in the image in MS Paint using the Stranger Things Font, and then I converted it to bitmap using javscript tools (Two.js and Canvas Plus). I'm not intending to make a ST game. I just wanted to see how much of the spirit of the intro theme I could capture. There are some spacing issues that I've been working on for days, and haven't been able to totally resolve. I'm not sure that I can without additional expert advice. Unfortunately, the chapter in Hugg's book that covers "A Big Movable Sprite" doesn't have any example code on 8bitworkshop... and it's not entirely clear from the code in the book what will work... at least to me anyway. The interlacing looks better on 8bitworkshop than it does on my 7800/CC2/Old-School tv combo. The my tube tv has seen better days, and I'm interested if it looks better on other setups for anyone who has a dev cart. Just load the code into 8bitworkshop to generate a ROM. There's no interactivity, it's just a render of the Stranger Things font. Any feedback is appreciated. Thanks, Aaron The code is attached interlaced-st-working.a
  3. Tonight I installed the development environment for DCP+, I will fiddle around with it and hopefully be able to suck some additional cycles from my scan lines. Ubuntu 14.05 - Check Shared Folders - Check ARM Compiler - Check Test Source Build - Check Using the DCP+ tools, I'll probably implement a horizontally scrolling broomball pitch... and dynamically build the scan line data (color, sprite, playball) using the ARM processor in the 4K of Display Ram. Hopefully this will give me the ability to render a more detailed goal area, in addition to removing the need of displaying 4 sprites on a scan line in the center section of the broomball pitch. Once I have a handle on that, I'll hopefully be ready to use CDF in the future.
  4. Thanks, I've always hated power supply issues. Even back when we had our 2600 as a kid, the biggest reason we stopped playing it was problems with the power supply. I have a traditional power supply on order. I'll check to see how the Gemini reacts once it arrives.
  5. Well... after posting about my Coleco Gemini not working, I realized I'm kind of stupid. It's been a while since I've seen my atari hardware, have just pulled a box of it from my mom's place. And what I thought was my 7800 is actually an Atari Jr. So the 7800 is probably in good working order. I guess I'll rummage through my stuff this weekend when I'm at my mom's place for xmas.
  6. Oh man, I'm incredibly stupid. Apparently, my 7800 is still at my mom's house. I took a closer look at what I thought was my 7800 and it's actually an Atari Jr. I know they don't really look a like, but if you haven't seen either one in a while... (I just got a box of my atari stuff from my mom's house) and you don't look at it closely... and... well... like I said, I'm stupid. Now that you mention it, my 7800 had like a tiny two prong blue plug. Anyway, the power supply works with the Atari Jr. So it explains why the tips are the same. I'll order a vintage power supply and see if I have better luck with the Gemini. Thanks for the help.
  7. I just noticed something with more testing. If I unplug the power supply from the power port, and then plug it back in, with the switch turned on... the voltage jumps up to around 3.60 volts from the power port, through the switch, and up to the input of the 7805 voltage regulator. And then, the voltage drops by 0.01 volts every second until it gets down to around 0.10 volts, then drops off more slowly, but eventually it drops down to 0. Could this possibly be a capacitor issue?
  8. When I test the power supply using the settings shown in the image to the left, the voltage at the tip of the power supply reads 13.5. The power supply is an Enercell 13.5V DC & 30 VDC * 1 AMP AC-TO-DC POWER ADAPTER #273-329 From what I can tell searching Google the Atari VCS, Atari 7800, and Coleco Gemini all use the same tip. Though I maybe wrong, if someone knows better, let me know. The power supply is supposed to be a smart power supply, which sends only the power necessary to run the electronic device. This power supply and tip work with my Atari 7800. With the power supply plugged into the Gemini, and using the same multimeter settings in the image, the power port registers 0.12 volts. With the switch on, the input voltage to the 7805 power regulator reads 0.12 volts. With the switch off, the input voltage to the 7805 power regulator reads 0 volts. Based on these readings, should I assume that the power port is bad?
  9. I think there is a way to do that. There's an optical audio port on the back of the xbox. I don't have anything to hook that up to... It's more like the xbox locks up and reboots itself (sometimes), or it just exits the game. I've never played before buying Rocksmith, so if I want to learn to play, I guess I should look for other opportunities to learn the basics. The one benefit of the game, it seems to have caused my daughter to gain an interest in music.
  10. So I popped open the Gemini chassis, and here's a photo of it. Not that I know what I'm looking at, but it doesn't seem to look like a disaster. I bought the volt meter thing that is seen in the photo... but I'm not clear where to hook it up to check the power. Where should I start?
  11. I added a full compliment of sprites for the pitch area. The original idea was to make the center of the pitch where the goalies and centers are located to split into an interlaced area. Where GRP0 would be both goalies on the A/B frames (no flicker, no space between scan lines), and GRP1 would be the alternating team centers on A and B (no flicker, but the center for each team would render on alternating scanlines). If that makes since... Anyway, I was having problems getting the timing on using NUSIZ0 right, so I gave up and rendered them with flicker for the time being. IDK, there's obvious work to be done. To my surprise, I have a playball line skip issue on my wingers/defense men areas (which I thought to be less complicated), but not on the goalie/center section of the pitch which also somehow loads the "goals" without interfering with the playball render. Overall, this sort of works, but the flicker annoys me, and I am unimpressed with the crappy "goals". I'm thinking it might be better to implement this vertically with a scrolling game area, rather than side-to-side. Source: http://8bitworkshop.com/?sharekey=ccda0b43336c985efdc0a72891c07a51
  12. I like it. I had access to a similar book of the interdependently published variety with a green cardboard cover about 10 years ago (actually, I think it was just the Stella programmers guide someone had typed up and bound with construction paper and a stapler), but this one is really very good. I would say it pretty thorough, and worth the money. So far, I've only found 1 minor typo. I should probably go back to Amazon and give the book a 5 star rating. Granted I really got into Atari programming 10 years ago, and built some Java-based tools to assist with development back then, so I had previous experience. So I can't say that I'm reading this book as a complete novice, but I doubt you'll find a much handier set of info about the VCS in a book form. I mean... honestly, 40 years out from launch... a pretty much complete book for novice and intermediate VCS programmers that also delivers a browser-based IDE... it's hard to believe you get all of that for $33. It's more than enough to get you started and half way to Omaha. It brought me back up to speed much more quickly than would have been possible otherwise... but I'm no expert.
  13. SpiceWare - is there anything I can do to help out with moving Spice C forward?
  14. The power supply is a relatively new, modern Radio Shack all-in-one power supply with swap-able tips. It's possible that I'm not use the proper connector, but it's the only one that fits. Does seem a little loose, but it does "click" into place when the power supply is plugged into the Gemini power port. It's a little hard to plug into the power port as it is recessed into the Gemini case more than you would expect. I suppose I can open it up, get a volt meter, and start posting photos of the innards as I try to find the issue. I have very little experience with that sort of thing. It's already not working, so I suppose the worst I could do is give myself a tiny shock.
  15. I'm just wondering how much it has helped you learn guitar, or if you already knew how to play before you got it. I have it, but it wasn't as fun as I had hoped it would be. On the xbox, it just seemed difficult to get it to work properly sometimes. As you can probably guess, I haven't played it in a while.
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